SCUBA: a Practical Guide for the New Diver

Total Page:16

File Type:pdf, Size:1020Kb

SCUBA: a Practical Guide for the New Diver SCUBA: A Practical Guide for the New Diver Special Edition By James A. Lapenta SEI Diving Instructor, CMAS 2 Star Instructor Edited by Elizabeth Babcock, MSW, LCSW Illustrated by Casey A. Peel With an introduction by Bernie Chowdhury – author of “The Last Dive” Disclaimers This book is not a manual to teach you how to SCUBA dive. That process requires training from a competent instructor in an organized class. No guarantee of safety without that training is stated or implied in any way. The opinions expressed herein are those of the author and do not necessarily reflect those of any other individual or entity, including businesses and training agencies. For information on training with the author, visit www.udmaquatics.com. The illustrations are representative of individuals, situations, and equipment in general, and not of any one specific person or item. Photos, where used, are of the author’s own personal equipment or are used with permission of the manufacturer and are noted as such. No photo should be interpreted as an endorsement of the brand shown. Copyright & Contact Information SCUBA: A Practical Guide for the New Diver. Copyright © 2010 by James A. Lapenta. All rights reserved. Printed in the United States of America. Information on purchasing additional copies or for permission to use the material herein may be obtained contacting the author through his website, www.udmaquatics.com. Any duplication in any manner of the materials contained in this work without the written permission of the author is expressly forbidden and protected under copyright. ISBN # 978-1-4507-5101-8 First Edition published 2011, by the author. Dedication Deciding who to dedicate this work to was a difficult matter. Many contributed to the thoughts contained herein. None of this would have come about if I had not taken up SCUBA diving in the first place. My initial inspiration for taking up diving came from Lloyd Bridges (Mike Nelson on Sea Hunt) and Jacques Cousteau with his Undersea World television series in the ‘60s. It took nearly 35 years for me to get my initial certification after watching them, but they played a huge part in the decision. Thanks. Once that decision was made, it was the support and encouragement of my late wife, Denise Lynne Churney, which not only saw me through my initial Open Water Class but made it possible for me to become an instructor. Few would have sacrificed what she did to see me through the whole process. For that I, and hopefully many others, will be eternally grateful. Rest in Peace. This still would not have come to fruition without the support and help of my editor and friend, Elizabeth Babcock. Her guidance in matters of writing and composition are why you will not be tearing your hair out trying to read this work. If not for her, this would likely be a jumble of words in some vague semblance of order, still in a file on my computer. Any diver whose enjoyment of this sport is made greater or whose safety is increased, and any life that may be saved, is due as much to her efforts in this as it is to my words. She has made the words flow and make sense in a way I could not. Love you. Thank you for everything. To my children, Josh and Katie, for just being you. To my grandfather, Dominic for teaching me to swim. To Casey Peel, for agreeing to do the illustrations in this book. Divers who lost their lives were the reason this was started. Their deaths, detailed later in this book, were probably preventable. I had to write this if there was any chance that some of my words might prevent some future fatalities from occurring. Finally, to all who desire to see first-hand what is under the surface of the water on SCUBA. This is for you. Introduction James Lapenta’s SCUBA: A Practical Guide for the New Diver is a trove of vital information for the new and aspiring diver, as well as for the more experienced. New divers may be surprised to learn that not all instructors and dive shops have the same focus – or strengths. The use of specific questions (listed in the pertinent sections) that the diver can direct at a potential instructor or dive shop should prove insightful. It should also help the diver to focus on what they themselves may want from their diving education and experiences and how to best achieve that. As James rightfully points out, proper buoyancy skills are critical. Without those skills, divers are not just frustrated and uncomfortable in the water, but they are a danger to themselves, to others, and to their environment. Typically, proper buoyancy takes the most time to master. When deciding which instructor to choose, a diver would do well to focus on how much time will be devoted in class to teaching buoyancy skills, and what sorts of skills are employed. Unfortunately, the high price of renting time at a swimming pool often means that these critical skills -- and the time to develop them -- are given short shrift in many classes. With the trend to ever shorter diving courses, a potential diving student may think they’re getting a good deal and that spending less time in a scuba class is a good idea. The reality is that a person only gets comfortable and learns to master diving skills through quality time spent underwater. This Guide raises the very important notion of finding an appropriate mentor. High-quality underwater time -- with either a skilled, attentive, patient instructor or with an experienced diver - - is the key for anyone wishing to grow in the sport. Professionals, such as Diving Instructors, Assistant Instructors and Dive Masters, are all very important in teaching the nuances of scuba diving. However, experienced divers and boat captains can also provide guidance. Finding a dive club or forming a casual group for camaraderie, adventure, to share knowledge and dive stories is an important part of maintaining interest in diving and realizing a lot of pleasure from it. James points out how and where one can reach out and find others to share the sport, and also to mentor the up-and-coming diver. This Guide should serve divers well, not only immediately, but also in the future; it has been designed to serve as a handy reference. Flipping through these pages between dive trips, dive classes, or in the off-season will undoubtedly give divers new thoughts to ponder and help steer their diving through many enjoyable years. Plan well, dive safely. Bernie Chowdhury DAN, NAUI, PADI, TDI Instructor Author – The Last Dive Dive Industry Feedback on SCUBA: A Practical Guide for the New Diver "I have recently had the opportunity to read an advance copy of the new book by Jim Lapenta. This well-written new book should be on every diver’s book shelf. Potential divers, new divers, and experienced pros will benefit from the wise and thoughtful information. I have a good library of diving books, manuals, magazines, etc. My first purchase was the New Science of Skin and Scuba, some 40 years ago. This will be a go-to book and is a new standard. Thank you, Jim. Great book." Michael Brennan President, Apollo Sports USA, INC. “Finally, a book with a no-nonsense approach on the art of scuba diving. Real life examples are presented throughout the book, which help drive home the points of proper and improper techniques. This should be a must-read for anyone that is interested in getting involved in the sport. Jim has presented the basics of scuba diving in a clear, easy-to-understand format that is not only good for the new diver, but a good review for the seasoned one.” Capt Gary Conch Republic Divers Master Scuba Diving Instructor with PADI and SSI Staff Instructor with SDI/TDI NSS Full Cave Diver “It is obvious that you are passionate about our sport and the safety of not only your students, but all divers. I applaud you for that.” Dan Orr, President Divers Alert Network (DAN) “Thank you for the privilege of reading your new book. While the “why” of diving hasn’t really changed, the reality is the “how” has undergone many dramatic changes in the last couple decades. Not only has instructional technique changed, but consumer expectations have radically shifted. This shift has left many in the dive instruction field and our students “not getting a view of the ocean for the cove.” Your book is a very down-to-earth and honest look at where we are and how new divers can find their way. I will recommend the book to divers new and old and more importantly, to instructors and dive shops.” Chris Richardson NAUI 17055 Technical and Recreational Course Director ACUC #1049EA Advanced Instructor TDI, ERDI and SDI Instructor #4587 PADI MSDT 157937 Foreword I am writing this in order to impress on new divers just what this activity called SCUBA diving is. While it is indeed a fun, relaxing, educational, interesting, and -- if approached properly -- safe activity, it is nonetheless a sport that has risks. SCUBA diving is in fact an extreme sport that can injure or even kill very quickly, and in some very nasty ways. What we are doing is entering an alien environment that is normally hostile to human life. We cannot breathe in water without some kind of mechanical assistance. In this case, we use a steel or aluminum high pressure cylinder, a means of reducing that pressure to a level that we can safely breathe (i.e., a regulator), and a means of controlling our buoyancy.
Recommended publications
  • Biomechanics of Safe Ascents Workshop
    PROCEEDINGS OF BIOMECHANICS OF SAFE ASCENTS WORKSHOP — 10 ft E 30 ft TIME AMERICAN ACADEMY OF UNDERWATER SCIENCES September 25 - 27, 1989 Woods Hole, Massachusetts Proceedings of the AAUS Biomechanics of Safe Ascents Workshop Michael A. Lang and Glen H. Egstrom, (Editors) Copyright © 1990 by AMERICAN ACADEMY OF UNDERWATER SCIENCES 947 Newhall Street Costa Mesa, CA 92627 All Rights Reserved No part of this book may be reproduced in any form by photostat, microfilm, or any other means, without written permission from the publishers Copies of these Proceedings can be purchased from AAUS at the above address This workshop was sponsored in part by the National Oceanic and Atmospheric Administration (NOAA), Department of Commerce, under grant number 40AANR902932, through the Office of Undersea Research, and in part by the Diving Equipment Manufacturers Association (DEMA), and in part by the American Academy of Underwater Sciences (AAUS). The U.S. Government is authorized to produce and distribute reprints for governmental purposes notwithstanding the copyright notation that appears above. Opinions presented at the Workshop and in the Proceedings are those of the contributors, and do not necessarily reflect those of the American Academy of Underwater Sciences PROCEEDINGS OF THE AMERICAN ACADEMY OF UNDERWATER SCIENCES BIOMECHANICS OF SAFE ASCENTS WORKSHOP WHOI/MBL Woods Hole, Massachusetts September 25 - 27, 1989 MICHAEL A. LANG GLEN H. EGSTROM Editors American Academy of Underwater Sciences 947 Newhall Street, Costa Mesa, California 92627 U.S.A. An American Academy of Underwater Sciences Diving Safety Publication AAUSDSP-BSA-01-90 CONTENTS Preface i About AAUS ii Executive Summary iii Acknowledgments v Session 1: Introductory Session Welcoming address - Michael A.
    [Show full text]
  • Leonardo User Manual
    Direction for use Computer Leonardo ENGLISH cressi.com 2 TABLE OF CONTENTS Main specifications page 4 TIME SET mode: General recommendations Date and time adjustment page 31 and safety measures page 5 SYSTEM mode: Introduction page 10 Setting of measurement unit and reset page 31 1 - COMPUTER CONTROL 3 - WHILE DIVING: COMPUTER Operation of the Leonardo computer page 13 FUNCTIONS 2 - BEFORE DIVING Diving within no decompression limits page 36 DIVE SET mode: DIVE AIR function: Setting of dive parameters page 16 Dive with Air page 37 Oxygen partial pressure (PO2) page 16 DIVE NITROX function: Nitrox - Percentage of the oxygen (FO2) page 18 Dive with Nitrox page 37 Dive Safety Factor (SF) page 22 Before a Nitrox dive page 37 Deep Stop page 22 Diving with Nitrox page 40 Altitude page 23 CNS toxicity display page 40 PLAN mode: PO2 alarm page 43 Dive planning page 27 Ascent rate page 45 GAGE mode: Safety Stop page 45 Depth gauge and timer page 27 Decompression forewarning page 46 Deep Stop page 46 3 Diving outside no decompression limits page 50 5 - CARE AND MAINTENANCE Omitted Decompression stage alarm page 51 Battery replacement page 71 GAGE MODE depth gauge and timer) page 52 6 - TECHNICAL SPECIFICATIONS Use of the computer with 7 - WARRANTY poor visibility page 56 4 - ON SURFACE AFTER DIVING Data display and management page 59 Surface interval page 59 PLAN function - Dive plan page 60 LOG BOOK function - Dive log page 61 HISTORY function - Dive history page 65 DIVE PROFILE function - Dive profile page 65 PCLINK function Pc compatible interface page 66 System Reset Reset of the instrument page 70 4 Congratulations on your purchase of your Leo - trox) dive.
    [Show full text]
  • Underwater Photographyphotography a Web Magazine
    UnderwaterUnderwater PhotographyPhotography a web magazine Oct/Nov 2002 Nikon D100 housings Fuji S2 housing Sony F707 housing Kodak DCS Pro 14n Sperm whale Nai’a liveaboard U/w photojournalist - Jack Jackson Henry the seadragon Scilly Seals Lights & divers Easy macro British fish Underwater tripod Visions 2002 UwP 1 What links these sites? Turn to page 7 to find out... UwP 2 UnderwaterUnderwater PhotographyPhotography a web magazine Oct/Nov 2002 e mail [email protected] Contents 4 Travel & events 30 Meet Henry 43 Easy macro 8 New products 14 Sperm whale by Andy & Angela Heath with Ee wan Khoo 35 Scilly Seals 47 British fish with Tony Wu 19 Nai’a liveaboard with Will & Demelza by Mark Webster Posslethwaite 54 Size matters 35 Lights & divers by Jukka Nurminen & Alex Mustard by Pete Atkinson 25 U/w photojournalist by Martin Edge Cover photo by Tony Wu 58 Visions 2002 by Jack Jackson UwP 3 Travel & events Jim Breakell Tahiti talk at Dive Show, Oct 12/13 2002 In September Jim Breakell of Scuba Safaris went on a fact finding trip to the Pacific. First off he went to Ryrutu for for a few days humpback whale watching, then a week on the inaugural trip of the Tahiti Aggressor and then on to Bora Bora (what a hard life he has!) He will be giving an illustrated talk about his trip at the Dive Show in Birmingham on October 12/13th 2002. For more information contact Scuba Safaris, PO Box 8, Edenbridge, Kent TN8 7ZS. Tel 01342 851196. www.scuba-safaris.com John Boyle video trip May 2003 INVITATION John Boyle will be hosting a video diving trip from Bali to Komodo on Kararu next year.
    [Show full text]
  • Theory and Treatment Solo Cave Diving
    Decompression Sickness: Theory and Treatment Solo Cave Diving: Just How Safe Is It? A Few Words About Decompression Schedules Cave Diving Into The Dominican Past Diving Pioneers & Innovators: A Series of In Depth Interviews (Dick Bonin) Issue 8 – September 2012 Contents Editorial Editorial 2 Welcome to the eighth issue of Tech Diving Mag. In this issue, the contributors have, once more, brought together a wealth Decompression Sickness: Theory and Treatment of information, along with some distinctive first hand experiences. The By Bret Gilliam 3 contributors for this issue are world renowned industry professional Bret Gilliam, accomplished diver, instructor trainer and book author Steve Lewis, technical diving instructor Peter Buzzacott (PhD) and Solo Cave Diving: Just How Safe Is It? cave explorer Cristian Pittaro. Get to know more about them and read By Peter Buzzacott 22 their bio at www.techdivingmag.com/contributors.html. As you might know, Tech Diving Mag is based on article contribution A Few Words About Decompression Schedules from the readership. So you’re always welcome to drop me a line if you’re interested in volunteering an article. One more much appreciated By Steve Lewis 29 thing is your photos (even without articles)! For submission guidelines, take a look at www.techdivingmag.com/guidelines.html. Cave Diving Into The Dominican Past Tech Diving Mag is very much your magazine and I am always keen By Cristian Pittaro 37 to have your input. If you want to share your views, drop me a line at [email protected]. Diving Pioneers & Innovators: A Series of In Please visit www.techdivingmag.com/communicate.html to subscribe Depth Interviews (Dick Bonin) to the newsletter in order to be notified when new issues are available for download.
    [Show full text]
  • Physiology of Decompressive Stress
    CHAPTER 3 Physiology of Decompressive Stress Jan Stepanek and James T. Webb ... upon the withdrawing of air ...the little bubbles generated upon the absence of air in the blood juices, and soft parts of the body, may by their vast numbers, and their conspiring distension, variously streighten in some places and stretch in others, the vessels, especially the smaller ones, that convey the blood and nourishment: and so by choaking up some passages, ... disturb or hinder the circulation of the blouod? Not to mention the pains that such distensions may cause in some nerves and membranous parts.. —Sir Robert Boyle, 1670, Philosophical transactions Since Robert Boyle made his astute observations in the Chapter 2, for details on the operational space environment 17th century, humans have ventured into the highest levels and the potential problems with decompressive stress see of the atmosphere and beyond and have encountered Chapter 10, and for diving related problems the reader problems that have their basis in the physics that govern this is encouraged to consult diving and hyperbaric medicine environment, in particular the gas laws. The main problems monographs. that humans face when going at altitude are changes in the gas volume within body cavities (Boyle’s law) with changes in ambient pressure, as well as clinical phenomena THE ATMOSPHERE secondary to formation of bubbles in body tissues (Henry’s law) secondary to significant decreases in ambient pressure. Introduction In the operational aerospace setting, these circumstances are Variations in Earthbound environmental conditions place of concern in high-altitude flight (nonpressurized aircraft limits and requirements on our activities.
    [Show full text]
  • 159333Dhmjournal Vol42 No1 Cover CS4.Indd
    Diving and Hyperbaric Medicine The Journal of the South Pacifi c Underwater Medicine Society (Incorporated in Victoria) A0020660B and the European Underwater and Baromedical Society Volume 42 No. 1 March 2012 Perfl uorocarbon emulsion for severe DCS Direct effect of Co2 on apnea-induced haemoglobin increase how consistent are doctors in assessing ‘fi tness to dive’? The health of recreational dive masters and instructors Risk factors for rapid ascent and buoyancy problems Scuba diver’s pulmonary oedema can be fatal ultrasound under pressure ISSN 1833 3516 Print Post Approved ABN 29 299 823 713 PP 331758/0015 Diving and Hyperbaric Medicine Volume 42 No. 1 March 2012 PURPOSES OF THE SOCIETIES To promote and facilitate the study of all aspects of underwater and hyperbaric medicine To provide information on underwater and hyperbaric medicine To publish a journal and to convene members of each Society annually at a scientific conference SOUTH PACIFIC UNDERWATER EUROPEAN UNDERWATER AND MEDICINE SOCIETY BAROMEDICAL SOCIETY OFFICE HOLDERS OFFICE HOLDERS President President Mike Bennett <[email protected]> Peter Germonpré <[email protected]> PastPresident Vice President Chris Acott <[email protected]> Costantino Balestra <[email protected]> Secretary Immediate Past President Karen Richardson <[email protected]> Alf Brubakk <[email protected]> Treasurer Past President Jan Lehm <[email protected]> Noemi Bitterman <[email protected]> Education Officer Honorary Secretary David Smart <[email protected]>
    [Show full text]
  • Cave Diving in Southeastern Pennsylvania
    The Underground Movement Volume 13, Number 11 CAVE DIVING IN SOUTHEASTERN PENNSYLVANIA November 2013 CAVE DIVING IN SOUTHEASTERN PENNSYLVANIA An Historical, Cultural, and Speleological Perspective of Bucks County — Danny A. Brass — Large portions of central and southern Pennsylvania are ipants than dry caving, cave diving still remains a global underlain by carbonate bedrock (primarily limestone and activity. Worldwide, a variety of cave-diving organiza- dolomite, but with smaller amounts of marble as well). tions can be found in areas rich in underwater caves. Ma- Over the course of geologic time, much of this bedrock jor cave-diving sites include the cenotes and tidal blue- has been exposed by gradual erosion of the overburden. holes of the Bahamas and Mexico’s Yucatán Peninsula, In combination with the abrasive activity of water-borne the vast underground rivers of Australia’s Nullarbor Plain sediments, the relentless action of weak acids (i.e., chemi- and the sinkholes of its unique Mt. Gambier region, the cal dissolution by acidic groundwater) on soluble car- sumps of Great Britain, and the rich concentration of bonate deposits, especially limestone, is a self- springs in Florida. Diving conditions vary greatly from accelerating process that has led to the development of one region to another. This is reflected in the many differ- broad areas of karst topography. A variety of surface and ences in training procedures, required equipment, under- subsurface geological features are characteristically asso- water protocols, and even diving philosophies, all of ciated with karstification; the presence of large numbers which have evolved in association with local diving con- of solution caves and sinkholes is common.
    [Show full text]
  • Press Release
    Contact: Maria Hults Phone: (631) 728.2285 [email protected] Beneath The Sea 2015 th 39 Anniversary Show: Dive Medicine Press Release Dive Medicine Beneath the Sea 2015 Dive Medicine, Education and Dive Safety That All Divers Should Know Friday, March 27th beginning 8:30 a.m. At the Meadowlands Exposition Cnter This years Dive Medicine Workshop will bring four national leaders in Dive Medicine, Dive Education and Dive Safety. Four topics reviewed will be the topics of Otic Barotrauma, Pros and Cons of warm Water vs. Cold water Training, in water recompression, and the very common concern what medications are safe for divers. At the conclusion of the lectures, there will be a panel discussion. The format will allow for audience participation and questions and answers session. Four Continuing Medical Education Category One Credits are available. Cost $75.00 Includes Lunch Otic Barotrauma Otic barotrauma is the most common injury that a diver faces on a regular basis. An overview of the gas laws will begin this discussion. Conditions related to barotrauma, the external, middle and inner ear will be discussed. We will emphasis those conditions that are due to barotrauma and distinguish those conditions that are related to decompression illness. Prevention, recognition and treatment will be discussed. The video otoscope will be used to demonstrate the various maneuvers in clearing the divers ears. Bio: David Charash DO, CWS, FACEP, UHM Dr. Charash is Board Certified in Emergency Medicine, and Undersea and Hyperbaric Medicine. David has completed training by the National Oceanic and Atmospheric Agency/Undersea and Hyperbaric Medicine as a Dive Medicine Physician, and Medical Examiner of Diver programs.
    [Show full text]
  • Diving Safe Practices Manual
    Diving Safe Practices Manual Underwater Inspection Program U.S. Department of the Interior February 2021 Mission Statements The Department of the Interior conserves and manages the Nation’s natural resources and cultural heritage for the benefit and enjoyment of the American people, provides scientific and other information about natural resources and natural hazards to address societal challenges and create opportunities for the American people, and honors the Nation’s trust responsibilities or special commitments to American Indians, Alaska Natives, and affiliated island communities to help them prosper. The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. Diving Safe Practices Manual Underwater Inspection Program Prepared by R. L. Harris (September 2006) Regional Dive Team Leader and Chair Reclamation Diving Safety Advisory Board Revised by Reclamation Diving Safety Advisory Board (February 2021) Diving Safe Practices Manual Contents Page Contents .................................................................................................................................. iii 1 Introduction .............................................................................................................. 1 1.1 Use of this Manual ............................................................................................. 1 1.2 Diving Safety .....................................................................................................
    [Show full text]
  • 2018 September;48(3):132−140
    Diving and Hyperbaric Medicine The Journal of the South Pacific Underwater Medicine Society and the European Underwater and Baromedical Society Volume 48 No. 3 September 2018 Subclavian Doppler bubble monitoring Australian snorkelling and diving fatalities 2012 Inner ear barotrauma – a tool for diagnosis Which tooth restoration for divers? HBOT for large bowel anastomosis problems ISSN 2209-1491 (online); ISSN 1833-3516 (print) ABN 29 299 823 713 CONTENTS Diving and Hyperbaric Medicine Volume 48 No.3 September 2018 Editorials 198 Baltic Symposium on Diving and Hyperbaric Medicine 2018 129 The Editor’s offering Fiona Sharp 130 Decompression sickness, fatness and active hydrophobic spots Pieter Jan AM van Ooij Book review 199 Gas bubble dynamics in the human body Original articles John Fitz-Clarke 132 Reliability of venous gas embolism detection in the subclavian area for decompression stress assessment following scuba diving Julien Hugon, Asya Metelkina, Axel Barbaud, Ron Nishi, Fethi Bouak, SPUMS notices and news Jean-Eric Blatteau, Emmanuel Gempp 141 Provisional report on diving-related fatalities in Australian 201 ANZ Hyperbaric Medicine Group waters in 2011 Introductory Course in Diving John Lippmann, Chris Lawrence, Andrew Fock, Scott Jamieson and Hyperbaric Medicine 2019 168 Impact of various pressures on fracture resistance and 201 Australian and New Zealand microleakage of amalgam and composite restorations College of Anaesthetists Diving Elnaz Shafigh, Reza Fekrazad, Amir Reza Beglou and Hyperbaric Medicine Special 173 Meta-analysis
    [Show full text]
  • International Consensus Standards for Commercial Diving and Underwater Operations
    International Consensus Standards FOR COMMERCIAL DIVING AND UNDERWATER OPERATIONS 6.2 EDITION ASSOCIATION OF DIVING CONTRACTORS INTERNATIONAL International Consensus Standards For Commercial Diving And Underwater Operations INTERNATIONAL CONSENSUS STANDARDS FOR COMMERCIAL DIVING AND UNDERWATER OPERATIONS 6.2 EDITION ASSOCIATION OF DIVING CONTRACTORS INTERNATIONAL, INC. Safety • Education • Communication i International Consensus Standards For Commercial Diving And Underwater Operations No responsibility is assumed by the Association of Diving Contractors International, Inc. (ADCI), its members, board of directors, officers or publisher for any injury and/or damage to persons or property as a matter of liability, negligence or otherwise, or from any use or operation of any methods, product, instruction, standards, rules or ideas contained in the material herein. No suggested test or procedure should be carried out unless, in the reader’s judgment, its risk is justified and the reader assumes all responsibility. All rights reserved. No part of this book may be reproduced, stored in a retrieval system or transmitted in any form or by any means (electronic, mechanical, photocopying, microfilming, recording or otherwise) without written per mission from the Association of Diving Contractors International, Inc. Copyright © Association of Diving Contractors International, Inc. Printed and bound in the United States of America. International Standard Book Number: 0-941332-45-4. Library of Congress control number: 95-077534. Published by: Association of Diving Contractors International, Inc. 5206 FM 1960 West, Suite 202 Houston, TX 77069 www.adc-int.org Third Edition 1991 Fourth Edition 1992 Fifth Edition 2004 Sixth Edition 2011 Sixth Edition 2014 (Revision 6.1) Sixth Edition 2016 (Revision 6.2) ii International Consensus Standards For Commercial Diving And Underwater Operations The Mission of the ADCI is: • To promote the highest possible level of safety in the practice of commercial diving and underwater operations.
    [Show full text]
  • Underwater Locomotor Performance in a Deep Diving Seabird Suggests Respiratory Strategies for Reducing Foraging Effort
    Buoyancy under Control: Underwater Locomotor Performance in a Deep Diving Seabird Suggests Respiratory Strategies for Reducing Foraging Effort Timothe´eR.Cook1,2*, Akiko Kato3,4, Hideji Tanaka5, Yan Ropert-Coudert4, Charles-Andre´ Bost2 1 DST/NRF Centre of Excellence, Percy FitzPatrick Institute of African Ornithology, University of Cape Town, Cape Town, South Africa, 2 Centre d’E´tudes Biologiques de Chize´ (CEBC), CNRS UPR 1934, Villiers-en-bois, France, 3 National Institute of Polar Research, Tokyo, Japan, 4 Institut Pluridisciplinaire Hubert Curien (IPHC), De´partement E´cologie, Physiologie et E´thologie (DEPE), Universite´ Louis Pasteur - CNRS, Strasbourg, France, 5 COE for Neo-Science of Natural History, Graduate School of Fisheries Sciences, Hokkaido University, Hakodate, Hokkaido, Japan Abstract Background: Because they have air stored in many body compartments, diving seabirds are expected to exhibit efficient behavioural strategies for reducing costs related to buoyancy control. We study the underwater locomotor activity of a deep-diving species from the Cormorant family (Kerguelen shag) and report locomotor adjustments to the change of buoyancy with depth. Methodology/Principal Findings: Using accelerometers, we show that during both the descent and ascent phases of dives, shags modelled their acceleration and stroking activity on the natural variation of buoyancy with depth. For example, during the descent phase, birds increased swim speed with depth. But in parallel, and with a decay constant similar to the one in the equation explaining the decrease of buoyancy with depth, they decreased foot-stroke frequency exponentially, a behaviour that enables birds to reduce oxygen consumption. During ascent, birds also reduced locomotor cost by ascending passively.
    [Show full text]